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Old 04-29-2007, 02:54 AM   #1
redrex2002
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Default pros and cons for diff. trannys

hey guys i am planning alot of things and was wondering which of these setups would be better over all hopefully i will be doing a full jdm engine swap with a gt52 and am wondering if i should go with a ppg built synchro box or the jdm/usdm 6 speed i know that the ppg's are goin to run me 4500 but i have never driven a 6 speed car and dont know how much they cost what the difference between the jdm/usdm 6 speeds are basically any info will help alot thanks in adv.
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Old 04-29-2007, 09:46 PM   #2
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evening bump
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Old 04-29-2007, 10:04 PM   #3
St.race
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i never could find myself comfortable with 5 speed, so...
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Old 04-29-2007, 11:33 PM   #4
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well if you do a 6spd swap into a wrx and still have the stock wheels and have an upgrade turbo you might find the gears to be waaaay too short.
with the 6spd and stock wrx wheels my 4th tops around 90-92 just to give you an idea of how short the gears really are. I'm pretty sure on an sti 4th tops a little over 100.
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Old 04-29-2007, 11:59 PM   #5
AruisDante
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JDM 6 speeds have a longer 4th and 5th. This is a good thing. They're also like 20 lbs heavier. Which, to the average person, shouldn't matter.

USDM 6 speeds are the same as JDM six speeds except for the aforementioned 4th and 5th, unless you get one that's MY07, in which case they got the longer 4th/5th. They're bullet proof in most cases. Unless you're making way more then 500HP, this is probably the tranny for you.

The JDM/USDM 6-speeds run about $4500. You also get DCCD, keep that in mind.

PPG gear boxes are even more bulliet proof then the 6-speeds. You also get mad gear whine, and you better be damn sure you know exactly where your rev match points are, or you're going to be rebuilding your tranny damn quick. Engagement in stop an go traffic will be brutal. You won't need to use your clutch unless you've come to a complete stop. You'll have lots of gear whine.

So there's the basic differences.
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Old 04-30-2007, 12:05 AM   #6
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Quote:
Originally Posted by AruisDante View Post
JDM 6 speeds have a longer 4th and 5th. This is a good thing. They're also like 20 lbs heavier. Which, to the average person, shouldn't matter.

USDM 6 speeds are the same as JDM six speeds except for the aforementioned 4th and 5th, unless you get one that's MY07, in which case they got the longer 4th/5th. They're bullet proof in most cases. Unless you're making way more then 500HP, this is probably the tranny for you.
I thought the JDM 6MT actually has the closer/shorter 4th and 5th?

-paK +2
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Old 04-30-2007, 12:31 AM   #7
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The RA 5 speeds certainly have closer 4th's and 5th's, but I was fairly sure that the JDM 6-speeds had longer 4ths and 5ths
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Old 04-30-2007, 12:59 AM   #8
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Actually, I actually mean't to say the 5th and 6th gears. But now I'm all sorts of puzzled
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Old 04-30-2007, 01:12 AM   #9
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JDM 6 speeds have shorter 5th and 6th. You are thinking of the USDM 6 speed with have the longer grearing. The thing with the 6spd that you have to remember is that you need more then just the trans where as the PPG gears will fit in existing case and bolt right up.

I think the PPG box you're (AruisDante) talking about is a DOG box which you can shift without clutching but they are hella expensive. The PPG to look at are is synco boxes that you can get either; straight cut (whines) or helical cut (little louder than stock). Both are very strong but these operate just like a regular transmission where you have to clutch to shift.

You need to know what you want this tranny for; drag or circuit. I think if your dragging the 5spd is the better choice and for the circuit go with the 6spd.

Hope this helps.
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Old 04-30-2007, 10:44 PM   #10
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ok thanks for all the info if i go with the 6 speed i will be using 17 of 18 inch wheels right now i have 18 oz wheels whii these help at all with the 1/4 i am not going for a straight drag queen i am going to be dding it and take it to the track whenever i can wither roadcourse autox or drag so from the sounds of it i shouls probably go with the six speed

but what does a shorter 5th and 6th mean does that mean that ill be reving higher going the same speed as i would be with the usdm cause if so ill just goi usdm to save gas ($3.35g can kiss my ass)

but i want to make sure that it can take some abuse not necessarly constant launches but some hard fun driving with around 350-400 whp can the 6 speeds take this?
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Old 05-01-2007, 01:41 AM   #11
AruisDante
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The six speed is one of the most durable trannies out there.

And yes, shorter 4th and 5th makes for more revs that the same speed.
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Old 05-01-2007, 02:01 AM   #12
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Quote:
Originally Posted by AruisDante View Post
The six speed is one of the most durable trannies out there.

And yes, shorter 4th and 5th makes for more revs that the same speed.

One more time, the JDM 6 speed "5" and "6" gears are shorter than the USDM 6 speed "5" and "6" gears.
The gears from 1-4 are the same ratio in both until 07.
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Old 05-01-2007, 12:10 PM   #13
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The PPG Helical Synchro 5speed tranny will be faster in the 1/4, on the street, and on the auto-x circuit....

PPG makes different gear ratios than the stock WRX 5spd tranny gearing...


The 6 speed has very steep gears and you are shifting all the time....

also, there is a lot of parts to swap to get the 6speed to work right.... probably 30 hours of work to get it done right... at least...

I recommend a good clutch, PPG 5spd helical syncro gearing and you might consider getting a JDM 5spd LSD front differential too....

GOOD LUCK!!!

RYNO


p.s.- as a dog box owner, I can honestly say that I love the gears, but, I don't think it would be overly enjoyable as a daily drivable car.... stay with the PPG Helical synchro gears....
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Old 05-01-2007, 05:25 PM   #14
redrex2002
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i think i might go either way the 6 speed would be geat for road courses but for drivability and less shifting the 5 speed would be easier to drive so i think i wil go with which ever is cheapest when it comes time thanks for all the info
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